JP2537703B2 - Heat exchanger fin structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of fins attached to an evaporator in a heat exchanger such as a cooling type compressed air dehumidifier.

[0002]

2. Description of the Related Art As a structure of fins mounted on a heat exchanger of a conventional cooling type compressed air dehumidifying device, a cooling pipe meandering in a dehumidifying passage has a baffle plate having a diameter smaller than the inner diameter of the passage and the inner diameter of the passage is substantially the same. It has been invented that a plurality of baffle rings each having a diameter and having an air circulation hole opened in the center are alternately mounted, and a type in which air is meanderingly flowed in a central portion, a peripheral portion and a central portion of a dehumidification passage is known. (Sho 57-59820).

[0003]

However, in the case of such a conventional heat exchanger, the baffle fin is made smaller than the inner diameter of the dehumidifying passage in order to meander the air flow.
Due to the fact that the air circulation hole is opened in the center of the baffle ring, the heat exchange area of the fins is narrow and it is not possible to perform sufficient heat exchange. There is a problem of increasing the size.
Further, in order to function as a fin, at least baffle fins and baffle rings must be mounted alternately on the cooling pipe, and if an operator makes a mistake in the order of the fins during assembly work, a part of the fins is heated. It cannot be used for exchange, and there is also a disadvantage that the heat exchange rate decreases.

Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide a fin structure of a heat exchanger which facilitates the work and has a sufficient heat exchange area. And

[0005]

Means for Solving the Problems That is, the present invention provides a heat transfer pipe arranged on the apex of a virtual regular polygon at a predetermined distance R from the center of the inner cylinder while meandering in the inner cylinder, and the heat transfer pipe. In a heat exchanger comprising a layer of fins having a plurality of holes for fitting in a pipe, the fins are provided with a plurality of cut-and-raised parts protruding in one direction, and the cut-and-raised parts flow in the heat exchanger. The bending line of the cut-and-raised part is arranged to coincide with the line radiated from the center of the inner cylinder so that the fluid flows perpendicularly to the heat transfer pipe so as to form a clockwise or counterclockwise circulating flow. The fin structure of the heat exchanger achieves this goal. According to the invention of claim 2, the heat transfer pipe is arranged on the apex of a virtual regular polygon at a predetermined distance R and distance r from the center of the inner cylinder while meandering in the inner cylinder, and the heat transfer pipe is fitted into the heat transfer pipe. In a heat exchanger consisting of a layer of fins having a plurality of holes for cutting, the fins are provided with a plurality of cut-and-raised parts protruding in one direction, and the cut-and-raised parts transfer the fluid flowing in the heat exchanger to the aforesaid Constructed so that the bending line of cut and raised so as to flow so as to form a clockwise or counterclockwise circulation flow perpendicular to the heat pipe matches the line radiated from the center of the inner cylinder and the adjacent outside This is a fin structure of a heat exchanger configured such that the distance between the holes and the distance between the inner holes are substantially the same.

[0006]

In the structure of the fin according to the present invention, the fin attached to the meandering heat transfer pipe closes the dehumidifying passage. However, each fin is provided with a plurality of cut-and-raises, which direct the air flow perpendicular to the heat transfer pipe. The resulting air is
While exchanging heat with the heat transfer pipes and fins for cooling, moisture in the air is condensed and dehumidified. At this time, the air flow is heat-exchanged with the entire fin, but the fin according to the present invention has a heat exchange area larger than that of the conventional one because the fin has a diameter substantially equal to the inner diameter of the dehumidification passage. The moving distance of the fluid flowing in the heat exchanger becomes long.

[0007]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows a front view of an embodiment of a fin according to the present invention, in which a heat transfer pipe 6 is placed at a virtual apex of a regular decagon inside a fin body 1 having a substantially circular shape. Ten holes 2 for inserting and inserting are formed, and a hole 3 is formed on the inner peripheral side of the hole 2 at the position of the apex of the virtual regular hexagon.

In the case of this embodiment, the distance between the holes 2 and 2 adjacent to each other is designed to be almost the same as the distance between the holes 3 and 3. The position is a square 3
A plurality of cut-and-raised parts 4 are formed by cutting out the sides and bending the remaining one side to the center, and the holes formed in the vicinity of the cut-and-raised parts 4 are air passage holes. The bending line of the cut-and-raised part 4 is configured to coincide with the line radiated from the center of the fin. As shown in FIG. 2, the air flow induced by the cut-and-raised parts 4 is bent in a directional manner so as to be a circulating flow to the right or left. Reference numeral 5 is a drain passage hole for guiding water droplets condensed on the fin body 1 along the dehumidification passage formed by the inner cylinder 7. In the present embodiment, the holes 2 and 3 are provided symmetrically with respect to the line. Two are provided above and below.

Generally, it is desirable that the total number of the holes 2 and 3 is an even number, and from the condition of this even number and the relation that the intervals between the holes are equal, the positions of the holes 2 on the outside (distance R from the center) and their positions. It can be determined by the number (N) of the holes 2 and the number (n) of the inner holes 3 and the position r (distance from the center) of the holes 3. The condition for matching the intervals is rsi
Since nπ / n = Rsinπ / N, r = (Rsinπ / N) / sinπ / n (Equation 1) When the numbers N and n of the holes are approximated, r becomes equal to R and the cut-and-raised It is preferable to select the number of the holes 3 so that the difference between r and R becomes an appropriate distance because there is no space for performing. Further, in order to exchange heat from the fins substantially evenly, it is desirable to make the ratio of the number N of the holes 2 and the number n of the holes 3 proportional to the squares of the distances R and r from the center. N: n≈R ² : r ² (Equation 2)

Next, FIG. 3 shows a second embodiment of the fin according to the present invention, in which holes 2 are formed on the outside of the fin body 1 at the positions of the vertices of a virtual regular octagon, and the holes are formed. A hole 3 is formed inside the above so as to satisfy the above expression 1 at the position of the apex of the virtual regular quadrangle. Further, a plurality of cut-and-raised parts 4 are provided between the holes 2 and 2 and between the holes 3 and 3 as in the above-described embodiment. In this embodiment, the drain passage holes 5 are provided at four places as shown in the figure. This is because when the holes 2 and 3 are arranged as shown in FIG. 3, rotational symmetry of 90 ° is obtained.

In the structure of the fins of the heat exchanger according to the present invention having the above-mentioned structure, a large number of fin bodies 1 are superposed on the heat transfer pipes 6 in the same direction to form a fin layer as shown in FIG. When this is installed in the heat exchanger, the air flowing into the dehumidification passage flows vertically to the heat transfer pipe due to the action of the cut-and-raised parts 4 formed in the fin body 1, and The induced flow direction is that which goes around the fin. Then, the air circulating around one fin flows into the space between the adjacent fins from the cut-and-raised parts 4 formed in the adjacent fin body 1, and passes through the fins one after another while circulating. Then, the air is cooled and the moisture contained in the air is condensed to become air having a low absolute humidity.

The condensed water drops flow down through the fins and are installed so that the drain passage holes 5 are located at the bottom of the dehumidification passage. Therefore, the drains are discharged to the drain traps through the drain passage holes 5. To be done.

In the present embodiment, the shape of the cut-and-raised portion 4 is configured as shown in FIG. 4, but the shape is not limited to this, and any structure that can be processed as shown in FIGS. Anything may be used, or two parallel notches may be provided as shown in FIG. 5, and then the notches may be extruded by a press or the like. Further, although the cut-and-raised parts are arranged to be installed between the holes, the cut-and-raised parts are not limited to this, and may be appropriately installed on the flat surface portion of the fin.

[0014]

As described above, since the fin structure according to the present invention does not have an opening for air passage as compared with the fin structure of the conventional heat exchanger, the heat exchange effective area can be widened. It is possible to provide a high heat exchange rate. Further, in the conventional heat exchanger, it takes a long time to work because there are at least two types of fins such as baffle fins and baffle rings, and they are inserted into the heat transfer pipe. Because of this, there is a tendency for an installation error to occur, but if the fin structure according to the present invention is used for assembly, there is only one type of fin, so there is no installation error. Furthermore, when the hole for fitting the heat transfer pipe is provided at the position of the apex of the virtual regular polygon, a large number of variations can be fitted to the heat transfer pipe of one fin, and the assembly can be performed. It can be made even easier.

[Brief description of drawings]

FIG. 1 is a front view of a fin according to the present invention.

FIG. 2 is a cross-sectional view taken along the line aa of FIG. 1, showing a state in which the fin according to the present invention is fitted and inserted in the heat transfer pipe.

FIG. 3 is a front view showing another embodiment of the fin according to the present invention.

FIG. 4 is a bb enlarged cross-sectional view of FIG. 1.

FIG. 5 is a side sectional view showing another embodiment of cutting and raising.

[Explanation of symbols]

 1 fin body 2 hole 3 hole 4 cut and raised

Claims (2)

(57) [Claims] 1. A center of the inner cylinder while meandering in the inner cylinder 7.
A heat exchange consisting of a heat transfer pipe 6 arranged on the apex of a virtual regular polygon at a predetermined distance R from this, and a layer of fins having a plurality of holes 2 and 3 for fitting in the heat transfer pipe 6. in vessels, the fin 1 by cutting and raising is projected in one direction 4 is provided with a plurality, the clockwise or Hidarikai perpendicular to the heat transfer pipe 6 fluid該切Ri raised 4 flows through the heat exchanger
Cut and raised to flow to form a circular flow
The fold line of is coincident with the line radiated from the center of the inner cylinder
Structure of fins of the heat exchanger, characterized by being configured so. 2. The center of the inner cylinder is meandered in the inner cylinder 7.
A heat transfer pipe 6 arranged on the vertices of a virtual regular polygon at a predetermined distance R and a predetermined distance r, and a plurality of holes 2 and 3 into which the heat transfer pipe 6 is fitted. in the heat exchanger consisting of a layer of fins, the fin 1 4 provided with a plurality cutting and raising which projects in one direction, the fluid該切Ri raised 4 flows through the heat exchanger to the heat transfer pipe 6 Vertical and right turn
Or flow counterclockwise to form a circular flow
A line that radiates the bending line of cut and raised from the center of the inner cylinder
Space between adjacent holes 2 and 2 that are configured to match
And the holes 3 and 3 are arranged at substantially the same distance.
The structure of the fins of the heat exchanger, which is characterized in that